/// Copyright (c) 2019 Razeware LLC
/// 
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation

class ScaryCreatureDatabase: NSObject {
  static let privateDocsDir: URL = {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    
    let documentsDirectoryURL = paths.first!.appendingPathComponent("PrivateDocuments")
    
    do {
      try FileManager.default.createDirectory(at: documentsDirectoryURL, withIntermediateDirectories: true, attributes: nil)
    } catch {
      print("Couldn't create directory")
    }
    
    print(documentsDirectoryURL.absoluteString)
    return documentsDirectoryURL
  }()
  
  class func nextScaryCreatureDocPath() -> URL? {
    guard let files = try? FileManager.default.contentsOfDirectory(at: privateDocsDir,
                                                              includingPropertiesForKeys: nil,
                                                              options: .skipsHiddenFiles) else {
                                                                return nil
    }
    
    var maxNumber = 0
    
    files.forEach {
      if $0.pathExtension == "scarycreature" {
        let fileName = $0.deletingPathExtension().lastPathComponent
        maxNumber = max(maxNumber, Int(fileName) ?? 0)
      }
    }
    
    return privateDocsDir.appendingPathComponent("\(maxNumber + 1).scarycreature", isDirectory: true)
  }
  
  class func loadScaryCreatureDocs() -> [ScaryCreatureDoc] {
    guard let files = try? FileManager.default.contentsOfDirectory(at: privateDocsDir,
                                                                   includingPropertiesForKeys: nil,
                                                                   options: .skipsHiddenFiles) else {
                                                                    return []
    }
    return files
      .filter { $0.pathExtension == "scarycreature" }
      .map { ScaryCreatureDoc(docPath: $0) }
  }
}
